The Crinoids fkom Dr. S. Hock"s Ivxi'ionrridX 'lo .Iai'an 1!>I 1. 147 



It seems to me as if Th. cypris were rallier iiulistinetly sepa- 

 rated from the above-described species. 



The dorsal prominences of the eii-rals are not developed in tiie 

 above specimens. Is this condition, perhaps, common to all small spe- 

 cies of the genus Tliauiiiatoiiietra'i If P.^ may hiive a genital gland in 

 Antedonince, and the dorsal prominences of the cii-rals may be absent 

 in BalltymctruKv the limit between the two sub-families becomes rather 

 vague. 



Pentacrinidse (d(>riu(;xv). 



Metacrinus P. H. C'aki'i:nti:k (Wyv. Tikims. M. S.). 

 M. nobilis var tenuis n. var. 



Fig. 1(31, 102. 



From St 7 (2), 9 (5), 5(5 (1), 58 (1) = specimens. Also a stem- 

 less crown without indication of the locality. 



Sp. 1 (St. 9) Full-grovvn internodes with 10 — 13 internodal joints, 

 13—18,5 mm. (8, 9 and 10 internodals each 1 case, 11:5 cases, 12 : 5 

 cases, 13:4 cases). Interarticular pores to the 12* internode. The 3 

 most proximal nodals without cirri. Full number of internodal joints 

 in the 0"' internode. The stem with 22 internodes; total length 275 

 mm. Diameter of the stem 3,r,— -1,5 mm. The segments are pentago- 

 nal, smooth; the 10 most distal internodes, however, with the joints 

 in the radial line a little concave and provided with small tubercles. 

 Here and there on the intei-nodals tubercles also IR. 



Cirri reaching over 2 — 2V''2 internodes. 50 segments (IX"' nodal) 

 U mm., U (XIII) 3() mm., 44 (XVI) 3(i mm., 40 (XVII) 31 mm., 40 

 (XVIII) 30 mm. 7"' segment L - br: 15 last segments with dorsal 

 spines. L of the terminal claw = l'/2 times the preceding segment. 



151) Cirrus Vi, 152) Br 2 and 3 wiili P, "i; l53-loi; Thanmat(»Hctra comastcr (St. 37), 

 153) Cirrus "/i, 154) P, 'Vi, 155) P.j witli a genital gland ",i, 150) An arm-stump with distal 

 jiinnules (a small genital gland from the 3d-tlie 5th segments) '/i ; 157. 158 Metaainus inter- 

 ruptns (Sp. 10) 157) P, (I Br 3) viewed somewhat more laterally than in the two follDwing spe- 

 cies, X 4 '2, 158) Cirrns a) Proximal part b) Distal part, X 4 ',8; 159. 160 Metacrimts rotundus 

 (Sp. 2) 159) P,, X 4';s. 160) Cirrus a) Proximal b) Distal part, X 4 '/»; 161, 162 Mitacihius no- 

 hilis tenuis (S)). 1) 161) Pj, X 4 '/s, 162) Cirrus a) Proximal part (observe: by the position of the 

 basal cirrals tlie cirrns is bent downwards, not, as in the two preceding species, upwards) b) Di- 

 stal part, X I ' » . 



